Kittens mature much faster than human babies, such that your 6 month old kitten (.5 years) would actually be equivalent to a 10 year old child. The relationship between feline age and human age, however, is not linear, and must be compared based on biological markers, such as weening, reproductive age, and average mortality. The calculator above is meant primarily for fun and the information should not be used for medical decisions. Ask your veterinarian for more information about the life markers of your furry companions.